Two groups — one led by Ting and the other by Richter — discover the charm quark by producing the charm-anticharm bound state, a particle that becomes known as the J/psi. The finding is hailed as the “November Revolution” because it promotes quarks from the status of a theoretical construct to an experimental reality.
What is charm quark:
The charm quark, charmed quark or c quark (from its symbol, c) is the third most massive of all quarks, a type of elementary particle. Charm quarks are found in hadrons, which are subatomic particles made of quarks. Examples of hadrons containing charm quarks include the J/ψ meson ( J/ψ ), D mesons ( D ), charmed Sigma baryons ( Σ c), and other charmed particles.
